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Influence of Multi-pass Friction Stir Processing on Microstructure and Mechanical Properties of Die Cast Al–7Si–3Cu Aluminum Alloy

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The influence of overlap multi-pass friction stir processing on the microstructure and the mechanical properties, in particular, strength, ductility and hardness of die cast Al–7Si–3Cu aluminum alloy was investigated. It was observed that increase in the number of overlap passes friction stir processing resulted in significant refinement and redistribution of aluminum silicon eutectic phase and elimination of casting porosities. The microstructural refinement by the friction stir processing not only increases the ultimate tensile strength from 121 to 273 MPa, but also increases the ductility as observed by the increase in fracture strain from 1.8% to 10%. Analysis of the fractured surface reveals that the microstructural refinement obtained by friction stir processing plays a vital role in transforming the fracture mode from completely mixed mode to the ductile mode of the fracture with increasing number of passes. The change in the size, shape, morphology and distribution of eutectic silicon particles and elimination of the porosities are the main reasons for the increases in tensile strength and ductility due to friction stir processing.

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Acknowledgments

The authors are grateful to the Centre for Materials Joining & Research (CEMAJOR), Department of manufacturing Engineering, Annamalai University, Annamalai Nagar, Tamil Nadu, India, for extending the facilities of Metal Joining Laboratory to carry out this investigation.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Madanapalle Institute of Technology and Science, Madanapalle, Andhra Pradesh, 517325, India

    L. John Baruch

  2. Department of Industrial Engineering, College of Engineering, Anna University, Chennai, Tamil Nadu, 600025, India

    R. Raju

  3. Department of Manufacturing Engineering, Centre for Materials Joining and Research (CEMAJOR), Annamalai University, Annamalai Nagar, Chidambaram, Tamil Nadu, 608002, India

    V. Balasubramanian

  4. Marine Materials Division, Naval Materials Research Laboratory, Thane, Maharashtra, 421506, India

    A. G. Rao

  5. Department of Mechanical Engineering Science, University of Johannesburg, Auckland Park Kingsway Campus, Johannesburg, 2006, South Africa

    I. Dinaharan

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  1. L. John Baruch
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  2. R. Raju
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  3. V. Balasubramanian
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  4. A. G. Rao
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Correspondence to I. Dinaharan.

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John Baruch, L., Raju, R., Balasubramanian, V. et al. Influence of Multi-pass Friction Stir Processing on Microstructure and Mechanical Properties of Die Cast Al–7Si–3Cu Aluminum Alloy. Acta Metall. Sin. (Engl. Lett.) 29, 431–440 (2016). https://doi.org/10.1007/s40195-016-0405-2

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  • DOI: https://doi.org/10.1007/s40195-016-0405-2

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